91 lines
2.6 KiB
Go
91 lines
2.6 KiB
Go
/*
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Copyright 2015 Shlomi Noach, courtesy Booking.com
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See https://github.com/github/gh-ost/blob/master/LICENSE
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*/
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package mysql
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import (
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"fmt"
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"regexp"
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"strconv"
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"strings"
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)
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var detachPattern *regexp.Regexp
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func init() {
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detachPattern, _ = regexp.Compile(`//([^/:]+):([\d]+)`) // e.g. `//binlog.01234:567890`
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}
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type BinlogType int
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const (
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BinaryLog BinlogType = iota
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RelayLog
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)
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// BinlogCoordinates described binary log coordinates in the form of log file & log position.
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type BinlogCoordinates struct {
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LogFile string
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LogPos int64
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Type BinlogType
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}
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// ParseInstanceKey will parse an InstanceKey from a string representation such as 127.0.0.1:3306
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func ParseBinlogCoordinates(logFileLogPos string) (*BinlogCoordinates, error) {
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tokens := strings.SplitN(logFileLogPos, ":", 2)
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if len(tokens) != 2 {
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return nil, fmt.Errorf("ParseBinlogCoordinates: Cannot parse BinlogCoordinates from %s. Expected format is file:pos", logFileLogPos)
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}
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if logPos, err := strconv.ParseInt(tokens[1], 10, 0); err != nil {
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return nil, fmt.Errorf("ParseBinlogCoordinates: invalid pos: %s", tokens[1])
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} else {
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return &BinlogCoordinates{LogFile: tokens[0], LogPos: logPos}, nil
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}
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}
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// DisplayString returns a user-friendly string representation of these coordinates
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func (this *BinlogCoordinates) DisplayString() string {
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return fmt.Sprintf("%s:%d", this.LogFile, this.LogPos)
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}
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// String returns a user-friendly string representation of these coordinates
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func (this BinlogCoordinates) String() string {
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return this.DisplayString()
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}
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// Equals tests equality of this coordinate and another one.
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func (this *BinlogCoordinates) Equals(other *BinlogCoordinates) bool {
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if other == nil {
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return false
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}
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return this.LogFile == other.LogFile && this.LogPos == other.LogPos && this.Type == other.Type
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}
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// IsEmpty returns true if the log file is empty, unnamed
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func (this *BinlogCoordinates) IsEmpty() bool {
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return this.LogFile == ""
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}
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// SmallerThan returns true if this coordinate is strictly smaller than the other.
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func (this *BinlogCoordinates) SmallerThan(other *BinlogCoordinates) bool {
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if this.LogFile < other.LogFile {
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return true
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}
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if this.LogFile == other.LogFile && this.LogPos < other.LogPos {
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return true
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}
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return false
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}
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// SmallerThanOrEquals returns true if this coordinate is the same or equal to the other one.
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// We do NOT compare the type so we can not use this.Equals()
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func (this *BinlogCoordinates) SmallerThanOrEquals(other *BinlogCoordinates) bool {
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if this.SmallerThan(other) {
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return true
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}
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return this.LogFile == other.LogFile && this.LogPos == other.LogPos // No Type comparison
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}
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